React Projects

Unit testing with Jest

Unit testing is an important part of your application since you want to know that your functions and components behave as expected, even when you make code changes. For this, you're going to use Jest, an open source testing package for JavaScript applications that was created by Facebook. With Jest, you can test assertions, for example, if the output of a function matches the value you expected.

To get started with Jest, you don't have to install anything; it's part of Create React App. If you look at the package.json file, you will see that a script is already there for running tests.

Let's see what happens if you execute the following command from your Terminal:

npm run test 

This will return a message saying No ...